Grinding and polishing shoe



Get. 79

J. CARRlE GRINDING AND POLISHING SHOE Filed May 23. 192] Llamas Carma Patented Oct. 7, 1924.

UNITED STATES 1,510,976 PATENT OFFICE.

JAMES CARRIE, 0E BUTLER, PENNSYLVANIA, ASSIGNOR TO WILLIAM D. SAWYEB,

OF MILWAUKEE, WISCONSIN.

GRINDING AND POLISHING SHOE.

Application filed May 23, 1921. Serial No. 471,797.

To all whom it may concem:

Be it .known that I, JAMES CARRIE, a subject of Great Britain, and resident of Butler, in the county of Butler and State of Pennsylvania, have invented certain new and useful Improvements in Grinding and Polishing Shoes; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention refers particularly to grinding and polishing machines of the planetary type, which machines are utilized for olishing' slabs of glass, marble or the 1' e, the invention being particularly applicable to polishing machines, as disclosed in my Patent No. 1,375,129 of April 19th, 1921.

The object of my present invention is to provide a simple, economical and effective polishing shoe for planetary drive mechanism, the arrangement and construction being such that the shoe being of elongated type, is so geared to a main shaft that the shoe in traveling about its orbit will describe one revolution upon its own axis, whereby owing to the elongated shape of the shoe the polishing surface will describe a rectangular track upon the material worked upon.

With the above object in view, the invention consists in certain eculiarities of construction and oombinatlon of parts, as are hereinafter set forth with reference to the accompanying drawings and subsequently claimed.

In the drawings: v

Figure 1 represents a diagrammatic'plan view of a polishing shoe embodying the features of my invention, the same being shown in connection with a main shaft and gear connection whereby the revolution of the shoe in polishing will develop a rectangular trafk or square, as indicated in the diagram, an

Figure 2 is a detail elevation of the shoe and associated parts, the same being partly in section and shown with felt lined polishing blocks in connection therewith for finishing the work.

Referring by characters to the drawings, 1 represents a main driven shaft having fixedly secured to its journal bearing a gear wheel 2. The end of the shaft carries a master arm 3, at the ends of which arm are journalled trunnions 4:, which trunnions are rigidly secured to t e central portion of an elongated grindin shoe 5 that is, in this instance, shown elliptical in shape, it being understood, however, that the particular shape may be varied somewhat. In practice, the width of the shoe is approximately twice its length, whereby the most effective results will be obtained. The lower face of the shoe, as shown in Figure 2, is formed with a usual grindin surface 5' and the opposite ends of the s 0e are a'pertured as at 66 for the reception of spindles 7 of detachable circular heads 8, which heads in this instance are shown encased in suitable felt polishing pads 8'. The pads are only used for finishing the product or highlv polishing it, and their spindles can be readi ly' inserted within the apertures and held in suspension by keys or pins 7 it being understood that these spindles simply revolve loosely in their bearings. When the elongated grinding shoes are utilized, the heads, of course, are removed.

The trunnion 4 of the polishing shoe hassecured thereto a tooth gear wheel 9, which gear wheel meshes with an idle gear wheel 9' that is mounted upon a stub shaft extending from the upper face of the master arm, the said. gear wheel being in mesh with a fixed gear wheel 2 that is secured to the sleeve 11 that forms a bearing for the main shaft 1. The gear mechanism for producing the planetary movement may be varied indefinitely, and it forms no part of my invention.

Referring particularly to Figure 1 of the drawing, it will be observed that when motion is imparted to the main shaft 1 in the direction indicated by the arrow, then an eighth of a revolution, will cause the shoe to rotate one eighth of a revolution in the opposite direction, due to the gear train connection, and in this one eighth of a revolution, the shoe will assume a position as indicated at A. The next eighth of a revolution will cause the shoe to assume a position, as indicated at A, and the next eighth will bring the shoe to a position as indicated at A", and when a half revolution of the shaft is developed, the shoe will assume the position as indicated at A. Hence, in a complete revolution about the orbit, the elongated shoe will describe one revolution about its own axis, and owing to the eculiar shape of said shoe in completing the cycle of its movement, it will develop a line of polished 110' surface as indicated by the rectangular efiective polishin dotted line B, and thus a more uniform and result is had, it being understood that t e mainshaft of the machine may travel in a straight line, or that the 'Work under the polishing shoe may be moved with respect to the machine.

ll claim:

In a grinding and polishing machine, the

comb-nation of an elongated grinding shoe and a pair of discs detachably secured loe- 11o low said shoe, said shoe being operative on removal of said discs for grindingpurposes.

In testimony that I clalm the oregomg I have hereunto set my hand at Butler, in the county of Butler and State of Pel- 115 Vania.

JAMES CARRIE. 

